The Inner Workings of JavaScript Source Maps
Source maps are the main piece in the jigsaw puzzle of mapping symbols and locations from "built" JavaScript files back to the original source code. When you debug minified JavaScript in your browser's DevTools and see the original source with proper variable names and formatting, you're witnessing source maps in action. For example, when your browser encounters an error at bundle.min.js:1:27698,
Source map format specification
About this Specification The document at https://tc39.es/ecma426/ is the most accurate and up-to-date source map specification. It contains the content of the most recently published snapshot plus any modifications that will be included in the next snapshot. Contributing to this Specification This specification is developed on GitHub. There are a number of ways to contribute to the development of
What are source maps? | Articles | web.dev
Source maps are a crucial tool in modern web development that make debugging significantly easier. This page explores the basics of source maps, how they're generated, and how they improve the debugging experience. The need for source maps Early web apps were built with low complexity. Developers deployed HTML, CSS, and JavaScript files directly to the web. More modern and complex web apps can nee
Source Map Visualization
This is a visualization of JavaScript/CSS source map data, which is useful for debugging problems with generated source maps. It's designed to be high-performance so it doesn't fall over with huge source maps. Drag and drop some files here or Upload files to get started. You can either drop a single JavaScript/CSS file with an inline source map comment, or a JavaScript/CSS file and a separate sour
Source maps in Node.js
Contributed by Benjamin Coe, who works on JavaScript client libraries at Google, is a collaborator on Node.js, and was the third engineer at npm, Inc. Photo by Soloman Soh from PexelsOf the 21,717 respondents to the 2019 State of JavaScript Survey, ~60% said that they spend time working in an alternate flavor of JavaScript, this is up from ~21% in 2016. Increasingly, when someone writes JavaScript
Node.js — Node.js 13.7.0 (Current)
Notable Changes deps: upgrade to libuv 1.34.1 (cjihrig) #31332 upgrade npm to 6.13.6 (Ruy Adorno) #31304 module add API for interacting with source maps (bcoe) #31132 loader getSource, getFormat, transform hooks (Geoffrey Booth) #30986 logical conditional exports ordering (Guy Bedford) #31008 unflag conditional exports (Guy Bedford) #31001 process: allow monitoring uncaughtException (Gerhard Stoeb
Oxidizing Source Maps with Rust and WebAssembly – Mozilla Hacks - the Web developer blog
Edit: Further algorithmic improvements yielded additional speedups over what is described here, for total speedups of up to 10.9x faster than the original implementation. Read about these extra gains in Speed Without Wizardry! Tom Tromey and I have replaced the most performance-sensitive portions of the source-map JavaScript Library’s source map parser with Rust code that is compiled to WebAssembl
ソースマップの自作は割とコワくない。 - Qiita
「めんどくさそう」先入観で敬遠していたのですが、仕様を見たらそんなでもなかったので書き残しておきます。手っ取り早くコードを見たい方はこちらをどうぞ。 ユーザとして、ソースマップに接する機会は多いですが、AltJSを作るとかでもない限り、あまり提供側に回ることはないかもしれません。私自身、次のような疑問というか誤解を抱えたまま、深入りしなかったクチです...。 誤解1: ソースマップを作るにはASTを作る必要がある → 実際はもっとシンプル 誤解2: なんかすごいエンコード(AAAA;AACA;AACA;AACA...)がされてる → ただのBase64 よく見かけるソースマップの説明記事(というほど、記事自体ないけれど)では、「ソースを構文解析してASTを構築して...」という手順が出てくるのですが、 ソースマップにASTは必要ありません。 もちろん、実際にAltJSを作るならASTの作成
HTML の script タグ内にインラインで書かれた js をデバッグする方法 - Qiita
はじめに HTML の script タグ内にインラインで書かれた js をデバッグする方法を共有します 本来であれば外部ファイルとして *.js にすべきですが、ワケあって <script> タグ内に js が書かれている場合に有効です！ この方法は script タグに囲まれた js を、 あたかも外部ファイルの js として扱えるようになります やってみよう 例えば、以下のような html があるとします。 <!DOCTYPE html> <html lang="ja"> <head> <meta charset="UTF-8"> <title>Qiita</title> </head> <body> <div id="hello">Hello World!</div> <script> document.querySelector('#hello').addEventListene
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GitHub - tc39/ecma426: Source map specification, RFCs and new proposals.
GitHub - jridgewell/trace-mapping: Trace the original position through a source map
GitHub - evanw/source-map-visualization: A simple visualization of source map data
process: add source-map support to stack traces by bcoe · Pull Request #29564 · nodejs/node
GitHub - unblu/js-source-extractor: Extracts source from javascript frameworks with sourcemap information (containing the source)
GitHub - macrat/source_downloader: SourceMapを展開して元のソースを見るやつ
don't let source-map-support use xhr - 25-75% speed improvement by lukeapage · Pull Request #5045 · jestjs/jest
Fast Source Map Generation for React Native
Source map visualization tool
GitHub - danvk/source-map-explorer: Analyze and debug space usage through source maps
Proposal for Encoding Source-Level Environment Information Within Source Maps